forked from slyrus/opticl
/
shapes.lisp
199 lines (178 loc) · 7.25 KB
/
shapes.lisp
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(in-package #:opticl)
(defun fill-image (img &rest vals)
(with-image-bounds (height width)
img
(loop for i below height
do (loop for j below width
do
(setf (pixel img i j) (values-list vals))))))
(defun fill-image* (img list)
(multiple-value-call #'fill-image img (values-list list)))
(defun horizontal-line (img y x0 x1 &rest vals)
(declare (type fixnum y x0 x1))
(with-image-bounds (ymax xmax)
img
(let ((y (constrain y 0 (1- ymax)))
(x0 (constrain x0 0 (1- xmax)))
(x1 (constrain x1 0 (1- xmax))))
(loop for x fixnum from x0 to x1
do (setf (pixel img y x) (values-list vals))))))
(defun horizontal-line* (img y x0 x1 list)
(multiple-value-call #'horizontal-line img y x0 x1 (values-list list)))
(defun vertical-line (img y0 y1 x &rest vals)
(declare (type fixnum y0 y1 x))
(with-image-bounds (ymax xmax)
img
(let ((y0 (constrain y0 0 (1- ymax)))
(y1 (constrain y1 0 (1- xmax)))
(x (constrain x 0 (1- xmax))))
(loop for y fixnum from y0 to y1
do (when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals)))))))
(defun vertical-line* (img y0 y1 x list)
(multiple-value-call #'vertical-line img y0 y1 x (values-list list)))
(defun draw-line (img y0 x0 y1 x1 &rest vals)
(declare (type fixnum y0 x0 y1 x1))
(let ((dx (- x1 x0))
(dy (- y1 y0)))
(declare (type fixnum dx dy))
(let ((absdx (abs dx))
(absdy (abs dy)))
(declare (type fixnum absdx absdy))
(let ((xstep (if (minusp dx) -1 1))
(ystep (if (minusp dy) -1 1)))
(if (>= absdx absdy)
(let ((d (- (* 2 absdy) absdx))
(incr-e (* 2 absdy))
(incr-ne (* 2 (- absdy absdx)))
(x x0)
(y y0))
(declare (type fixnum d incr-e incr-ne x y))
(when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals)))
(dotimes (i absdx)
(cond
((<= d 0)
(incf d incr-e)
(incf x xstep))
(t
(incf d incr-ne)
(incf x xstep)
(incf y ystep)))
(when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals)))))
(let ((d (- (* 2 absdy) absdx))
(incr-n (* 2 absdx))
(incr-ne (* 2 (- absdx absdy)))
(x x0)
(y y0))
(declare (type fixnum d incr-n incr-ne x y))
(when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals)))
(dotimes (i absdy)
(cond
((<= d 0)
(incf d incr-n)
(incf y ystep))
(t
(incf d incr-ne)
(incf y ystep)
(incf x xstep)))
(when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals))))))))))
(defun draw-line* (img y0 x0 y1 x1 list)
(multiple-value-call #'draw-line y0 x0 y1 x1 img (values-list list)))
(defun draw-circle (img center-y center-x radius &rest vals)
"draws a circle centered at (x, y) with radius r on a image."
(declare (type fixnum center-y center-x radius))
(flet ((pixel-if (y x vals)
(when (pixel-in-bounds img y x)
(setf (pixel img y x) (values-list vals)))))
(flet ((circle-points (y x)
(pixel-if (+ center-y y) (+ center-x x) vals)
(pixel-if (+ center-y x) (+ center-x y) vals)
(pixel-if (- center-y x) (+ center-x y) vals)
(pixel-if (- center-y y) (+ center-x x) vals)
(pixel-if (- center-y y) (- center-x x) vals)
(pixel-if (- center-y x) (- center-x y) vals)
(pixel-if (+ center-y x) (- center-x y) vals)
(pixel-if (+ center-y y) (- center-x x) vals)))
(let ((x 0)
(y radius)
(d (- 1 radius))
(delta-e 3)
(delta-se (+ (* -2 radius) 5)))
(declare (type fixnum x y d delta-e delta-se))
(circle-points y x)
(do () ((>= x y))
(if (< d 0)
(progn
(incf d delta-e)
(incf delta-e 2)
(incf delta-se 2))
(progn
(incf d delta-se)
(incf delta-e 2)
(incf delta-se 4)
(decf y)))
(incf x)
(circle-points y x))))))
(defun draw-circle* (img center-y center-x radius list)
(multiple-value-call #'draw-circle img center-y center-x radius (values-list list)))
(defun fill-circle (img center-y center-x radius &rest vals)
"draws a filled circle centered at (x, y) with radius r on a image."
(declare (type fixnum center-y center-x radius))
(flet ((circle-lines (y x)
(apply #'horizontal-line img (- center-y y) (- center-x x) (+ center-x x) vals)
(apply #'horizontal-line img (- center-y x) (- center-x y) (+ center-x y) vals)
(apply #'horizontal-line img (+ center-y y) (- center-x x) (+ center-x x) vals)
(apply #'horizontal-line img (+ center-y x) (- center-x y) (+ center-x y) vals)))
(let ((x 0)
(y radius)
(d (- 1 radius))
(delta-e 3)
(delta-se (+ (* -2 radius) 5)))
(declare (type fixnum x y d delta-e delta-se))
(circle-lines y x)
(do () ((>= x y))
(if (< d 0)
(progn
(incf d delta-e)
(incf delta-e 2)
(incf delta-se 2))
(progn
(incf d delta-se)
(incf delta-e 2)
(incf delta-se 4)
(decf y)))
(incf x)
(circle-lines y x)))))
(defun fill-circle* (img center-y center-x radius list)
(multiple-value-call #'fill-circle img center-y center-x radius (values-list list)))
(defun draw-rectangle (img y0 x0 y1 x1 &rest vals)
(apply #'horizontal-line img y0 x0 x1 vals)
(apply #'vertical-line img y0 y1 x0 vals)
(apply #'vertical-line img y0 y1 x1 vals)
(apply #'horizontal-line img y1 x0 x1 vals))
(defun draw-rectangle* (img y0 x0 y1 x1 list)
(multiple-value-call #'draw-rectangle img y0 x0 y1 x1 (values-list list)))
(defun fill-rectangle (img y0 x0 y1 x1 &rest vals)
(loop for x from x0 to x1
do
(apply #'vertical-line img y0 y1 x vals)))
(defun fill-rectangle* (img y0 x0 y1 x1 list)
(multiple-value-call #'fill-rectangle img y0 x0 y1 x1 (values-list list)))
(defun draw-triangle (img y0 x0 y1 x1 y2 x2 &rest vals)
(apply #'draw-line img y0 x0 y1 x1 vals)
(apply #'draw-line img y1 x1 y2 x2 vals)
(apply #'draw-line img y2 x2 y0 x0 vals))
(defun draw-triangle* (img y0 x0 y1 x1 y2 x2 list)
(multiple-value-call #'draw-triangle img y0 x0 y1 x1 y2 x2 (values-list list)))
(defun draw-polygon (img points &rest vals)
(loop for p across points
do (let ((p1 (elt p 0))
(p2 (elt p 1)))
(when (and (consp p1) (consp p2))
(apply #'draw-line img (car p1) (cdr p1) (car p2) (cdr p2) vals)))))
(defun draw-polygon* (img points list)
(multiple-value-call #'draw-polygon img points (values-list list)))